Post Offices

Post Offices in & near Keystone, South Dakota. Operating hours, locations, phone/fax number, services information.

Keyston Post Office

Post Office in Keystone, South Dakota on Swanzey St. Operating hours, phone number, services information, and other locations.

Address: 233 Swanzey St, Keystone, SD 57751
Phone: 605-666-4830
Fax: 605-357-4906
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Retail Hours

Monday 8:00am - 12:30pm, 1:00pm - 2:30pm
Tuesday 8:00am - 12:30pm, 1:00pm - 2:30pm
Wednesday 8:00am - 12:30pm, 1:00pm - 2:30pm
Thursday 8:00am - 12:30pm, 1:00pm - 2:30pm
Friday 8:00am - 12:30pm, 1:00pm - 2:30pm
Saturday 9:00am - 10:00am
Sunday Closed

Lobby Hours

Monday 6:00pm
Tuesday 6:00pm
Wednesday 6:00pm
Thursday 6:00pm
Friday 6:00pm
Saturday 6:00pm
Sunday Closed

Last Collection Times

Monday 8:00am - 12:30pm, 1:00pm - 2:30pm
Tuesday 8:00am - 12:30pm, 1:00pm - 2:30pm
Wednesday 8:00am - 12:30pm, 1:00pm - 2:30pm
Thursday 8:00am - 12:30pm, 1:00pm - 2:30pm
Friday 8:00am - 12:30pm, 1:00pm - 2:30pm
Saturday 9:00am - 10:00am
Sunday Closed